# CVE-2026-23226: ksmbd: add chann_lock to protect ksmbd_chann_list xarray

CVE-2026-23226 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-23226, released February 18, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-23226
- Priority: High
- CVSS: 7.8 (Important)
- EPSS: 0.0051
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 18, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23226

## Description

In the Linux kernel, the following vulnerability has been resolved:  ksmbd: add chann_lock to protect ksmbd_chann_list xarray  ksmbd_chann_list xarray lacks synchronization, allowing use-after-free in multi-channel sessions (between lookup_chann_list() and ksmbd_chann_del).  Adds rw_semaphore chann_lock to struct ksmbd_session and protects all xa_load/xa_store/xa_erase accesses.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.85-1 | [DEBIAN-CVE-2026-23226](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23226.md) | Feb 18, 2026 |
| Linux | linux Debian 14 | 6.18.12-1 | [DEBIAN-CVE-2026-23226](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23226.md) | Feb 18, 2026 |

---

Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.